Dust removing arrangement for looms



June 24, 1969 M. RIHA ET AL.

DUST REMOVING ARRANGEMENT FOR LOOMS I Filed Dec. 22. 1967 T v w m n w MAH J w 4 P a. m M m United States Patent US. Cl. 139-1 Claims ABSTRACTOF THE DISCLOSURE An elongated suction nozzle is positioned across theWarp directly above the reed and adjacent the heddles of a loom so thatair currents containing dust are fanned by the oscillating reed into theinlet of the suction nozzle.

Background of the invention The operation of a loom produces dust,particularly in the region where the reed oscillates and is bounded inthe rear by the shed forming heddles. In this region, the heddle eyesand the reed slide with considerable friction on the warp threads andproduce dust.

Particularly if cotton yarns or cellulose fibers are woven, so much dustis developed that the conditions become unsantiary and the health of theoperators of the loom is endangered. Furthermore, the dust accummulateson the warp, the heddles, and on the helds of the warp stop motion,increasing the danger of warp thread breakage.

It is known to provide casings enveloping parts of the loom if highlydust producing material is woven, such as asbestos. Since the loom ispartly covered, the observation of the weaving operations by theattendant is impaired. It is known to provide such casings covering theloom with manifolds leading to exhaust devices. It is known to providesuction casings on the breast beam, above the heddles, and in the spacebelow the warp. Suction casings above the heddles or at the breast beamhave no effect in the area where the greatest amount of dust is producedby the oscillating reed. Moreover, a suction casing placed above theheddles limits access to the heddles and warp stop motions. Suctioncasings disposed below the warp have very little effect since theyremove only heavier impurities dropping from the warp, while lightfloating dust entrained in the aircurrents produced by the reed remainsin the air and is not sucked oif.

Summary of the invention It is one object of the invention to overcomethe dis-- advantages of known suction devices for looms.

Another object of the invention is to provide a suction deviceparticularly effective in the region of the loom where the greatestamount of dust is developed.

Another object of the invention is to use the air currents produced bythe reed to carry the dust into a suction nozzle.

With these objects in view, the present invention is applied to a loomof any usual construction having, for example, heddles and anoscillatory reed.

One embodiment of the invention provides suction nozzle means disposedacross the warp and located above the reed in such a position that aircurrents created by the oscillatory reed are directly fanned into thesuction nozzle means together with dust entrained therein and are suckedinto the suction nozzle.

In the preferred embodiment of the invention, the suc- 3,451,435Patented June 24, 1969 tion nozzle has the shape of a trough with frontand rear walls extending at an angle to each other and being joined ontop, while forming an inlet opening at the bottom. The suction nozzlebody forms a beam extending across the entire width of the warp, andlocated directly over the reed when the same is in the rearward positionin the region of the heddles. The rear wall of the suction nozzle bodyextends parallel to the heddles and covers the same so that air currentsproduced by the oscillating reed cannot flow into the region of theheddles and deposit dust on the same, but enter the suction inlet of thenozzle body which is suitably slanted in forward and upward direction toreceive the air currents during the movement of the reed between therearward position and the forward position.

Due to the fact that the air currents and the dust therein are directedinto the inlet opening of the suction nozzle the suction effect producedby suitable exhaust means connected to the nozzle is considerablyincreased. It is advantageous to use a grid closing the inlet opening ofthe suction nozzle and to make the front wall of the suction nozzleshorter than the rear wall of the suction nozzle. The rear wall which isadjacent the heddles can be perforated so that a suction effect is alsoexerted on the heddles, and dust is removed from this region of thesame. At least one side wall of the suction nozzle is connected by asuction hose to an exhaust device, or to a duct of a larger exhaustsystem by which negative pressure is created.

The novel features which are considered as characteristic for theinvention are set forth in particular in the appended claims. Theinvention itself, however, both as to its construction and its method ofoperation, together with additional objects and advantages thereof, willbe best understood from the following description of specificembodiments when read in connection with the accompanying drawings.

Brief description of the drawing FIG. 1 is a schematic side viewillustrating an embodiment of the invention; and

FIG. 2 is a fragmentary schematic perspective view of the embodiment ofFIG. 1, partly in vertical section.

Description of the preferred embodiment A suction nozzle body 1 whichhas substantially the shape of a prism with three sides, has front andrear walls 6 and 4 extending at an acute angle to each other and havingupper ends joined in a horizontal apex line. Triangular side walls closethe ends of the nozzle, and at least one end is connected with a suctionhose 8 leading to a rotary exhaust device of known construction. Thelower edges 12 of front and rear walls 6 and 4 and of the triangularside walls, form an inlet opening which is preferably closed by a grid 7shown to be a plate with perforations 7a. The suction nozzle body 1extends across the entire warp and is supported on schematicallyillustrated brackets 2 projecting from a frame 3 of the loom. The rearwall 4 extends parallel to the plane of the upper parts of the heddles5, and downward into the proximity of the upper edge of an oscillatoryreed 10 which is movable between the rearward position adjacent thelower parts of the heddles 5, as shown in solid lines in FIG. 1, and theforward position shown in broken lines in which a weft thread is beateninto the fabric 20 which is guided over a beam 21.

The heddles 5 move parallel to the rear wall 4 to form warp sheds 22into which the weft is inserted. The front wall 6 is shorter than therear wall 4 so that the area of the reed and heddle eyes can be observedby the attendant. The grid 7 is thus placed in a forwardly and upwardlyinclined position in the inlet of the suction nozzle 1 which facilitatesthe entry of air currents produced by the oscillating reed 10 and fannedby the upper end of the same into the suction nozzle 1 through inletopenings 7a. The grid 7 is preferably located slightly above the loweredges 12 of walls 6 and 4. The suction nozzle body 1 covers the heddlesso that the dust containing air currents produced by the reed cannotreach the heddles, and moreover, openings 11 are provided in rear wall 4to suck air and dust from the heddles.

When reed 10 oscillates between the rear position shown in solid linesand the front position shown in broken lines, an air current containingdust is produced which is influenced by the reciproctaing heddles 5 tomove in the direction of the arrow A into the inlet openings 7a of thebottom grid 7 of the suction nozzle body 1, together with the dustentrained therein, thus increasing and improving the suction draftproduced by the nozzle. The combined fanning effect produced by theoscillating reed, and suction effect produced by the nozzle 1 assuresthe removal of almost all the dust created by the reed and heddle eyes,while dust is removed from the upper parts of the heddles 5 by thesuction exerted through inlet openings 11 in rear wall 4. The rotaryexhaust device 9 may be driven by an electric motor, not shown.

It will be understood that each of the elements described above, or twoor more together, may also find a useful application in other types oflooms differing from the types described above.

While the invention has been illustrated and described as embodied in anexhaust nozzle extending across the warp directly over the reed andadjacent the heddles, it is not intended to be limited to the detailsshown since various modifications and structural changes may be madewithout departing in any way from the spirit of the present invention.

What is claimed as new and desired to be protected by Letters Patent isset forth in the appended claims.

1. In a loom including means for guiding warp threads to form a warphaving a predetermined width, and an oscillatory reed movable between aforward position and a rearward position and having an upper end movingalong a path during oscillation of said reed, in combination, exhaustmeans for creating negative pressure, and including suction nozzle meanshaving an inlet disposed across said warp and being located directlyabove said path so that air currents are upward fanned from said upperend of said reed directly into said inlet during oscillatory movement ofsaid reed and sucked into said suction nozzle means together with dustentrained therein.

2. A loom as claimed in claim 1 wherein said means for guiding warpthreads include heddles having a lower part located rearward of saidreed in said rearward position adjacent to the same, and having an upperpart located rearward of said suction nozzle means adjacent to the sameso that the rearward part of said inlet is located directly over saidreed in and near said rearward position.

3. A loom as claimed in claim 1, wherein said suction nozzle meanscomprises an elongated nozzle body whose length corresponds to the widthof the loom, said body being closed on top, and open at the bottom toform said inlet for the entry of air and dust.

4. A loom as claimed in claim 3 wherein said nozzle body has front andrear walls having joined upper ends located on top of said nozzle body,said walls having lower edges bounding an opening forming said inlet ofsaid nozzle body.

5. A loom as claimed in claim 4 wherein said nozzle body comprises agrid located in said opening and forming the bottom wall of said nozzlebody.

6. A loom as claimed in claim 5 wherein said front wall is shorter thansaid rear ball; and wherein said grid is slanted forwardly and upwardlyto receive said air currents.

7. A loom as claimed in claim 4 wherein said means for guiding said warpthreads comprise heddles located in a plane transverse to said warp andrearward of said reed; wherein said rear wall is located adjacent saidheddles and extends parallel to the same into the proximity of said reedso that said rear wall deflects said air current containing dust fromsaid heddles and into said opening of said nozzle body; and wherein saidfront wall is shorter than said rear wall.

8. A loom as claimed in claim 7 wherein said rear wall of said nozzlebody has openings for sucking air and dust from said heddles.

9. A loom as claimed in claim 1 wherein said means for guiding said warpthreads comprise heddles extending transversely to said warp rearward ofsaid reed; wherein said nozzle means is an elongated nozzle body havinga front wall and a rear wall extending at an acute angle to each otherand having upper ends joined in an apex line located on top of saidnozzle body, and side walls at the ends of said front and rear walls,said front wall being shorter than said rear Wall, and said rear wallextending adjacent said heddles, the lower edges of said front, rear,and side Walls bounding said inlet of said nozzle body located in aforwardly and upwardly slanted plane over said reed in and near saidrearward position for receiving said air currents.

10. A loom as claimed in claim 9 wherein said nozzle body comprises aforwardly and upwardly slanted grid located in said air inlet; andwherein said exhaust means include a suction hose connected to saidnozzle means and located laterally of said heddles and reed on one sideof said loom.

References Cited UNITED STATES PATENTS 1,850,502 3/1932 Hilker.3,156,264 11/1964 Maguire et al. 3,311,135 3/1967 Maguire et al.3,378,998 4/1968 Shackleford.

FOREIGN PATENTS 638,167 3/1962 Canada. 111,342 7/ 1964 Czechoslovakia.

JAMES KEE CHI, Primary Examiner.

